Re: [JAVA3D] put a Texture ones on an object???

[Stoney Jackson]

(You'll want to use a fixed width font to view this article)   First, use textures with transparent backgrounds, and make sure their boundary pixels are transparent.   Second, use DECAL texture mode.   Now, for each texture, supply the geometry with texture coordinates that stretch the texture's transparent border over those coordinates that you don't want textured, and stretch the texture over those coordinates that you do want textured.   If done properly, the textures will not interfere with each other, and will be positioned properly.   Example:   Consider a TriangleStripArray with 6 coords:   (0)---(2)---(4)  |   / |   / |  |  /  |  /  |  | /   | /   | (1)---(3)---(5)   Now suppose we want a texture of a circle to map to the left rectangle (i.e., the rectangle formed by 0, 1, 2, and 3), and a texture of a square to map to the right rectangle (i.e., the rectangle formed by 2, 3, 4, and 5). The texture coordinates you should supply to the geometry follow.   Circle's corresponding texture coordinates:   (0,1)-(1,1)-(1,1)   |   / |   / |   |  /  |  /  |   | /   | /   | (0,0)-(1,0)-(1,0)   Square's corresponding texture coordinates:   (0,1)-(0,1)-(1,1)   |   / |   / |   |  /  |  /  |   | /   | /   | (0,0)-(0,0)-(1,0)   Thus, the circle is mapped to the left rectangle, and its right edge is stretched across the right rectangle. Similarly, the square is mapped to the right rectangle, and its left edge is stretched across the left rectangle. That's why it is important that the edges of the texture are transparent and you are using DECAL texture mode.   There are many similar tricks, I leave them to you to figure out.   Note that each texture is still being applied across the entire geometry. So, if used unwisely, this technique could cause a significant performance problems.   -Stoney   ----- Original Message ----- From: Martin Frey To: [EMAIL PROTECTED] Sent: Wednesday, October 23, 2002 7:53 AM Subject: [JAVA3D] put a Texture ones on an object??? Hello out there does somebody know how to put a texture on an object, so that the texture is not drawn ower the whole object. I need to put several textures to thier specified positions on the object. I think this should be possible?... At the moment i can only put a texture on an object, and whatever i do java3d draws this texture many times on that object, but i just need it on time. Does someone know a solution for this?   regards Martin